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Franchitti suffers concussion, fractures to spine and ankle in the wreck

Franchitti's car bumped, careens into fencing at Houston Grand Prix

The crash hurt 13 spectators, 3 of whom were taken to a hospital

The three-time Indy 500 winner and wife Ashley Judd announced divorce in January

Three-time Indianapolis 500 winner Dario Franchitti was injured in a serious crash that also left 13 spectators hurt during Sunday's Grand Prix of Houston, authorities reported.

The wreck occurred in the last lap of the race, when Japanese driver Takuma Sato bumped Franchitti's car, sending it airborne into the protective fencing. The car spun multiple times against the fence, sending shards of debris flying toward the grandstands and shearing off part of its side. Read more from Bleacher Report

Three spectators were sent to a local hospital, where they were listed in good condition Sunday night. The rest were treated at the scene, according to Senior Capt. Ruy Lozano of the Houston Fire Department.

Franchitti, 40, suffered a concussion in the wreck and fractures to his spine and ankle. The spinal fracture does not require surgery, according to Dr. Michael Olinger, director of medical services for IndyCar. Franchitti will be kept overnight at Memorial Hermann-Texas Medical Center in Houston.

The Scotland native won IndyCar racing's top prize in 2012, 2010 and 2007. He was married to actress Ashley Judd for more than 11 years, but the couple announced in January that they were ending their marriage.